Preliminary analysis shows that two of its archaea may be among the most primitive organisms on earth.

Trogocytosis might have appeared first in very primitive organisms to feed off other cells.

The greater part of these bore impressions of primitive organisms.

The gene is distinct and similar to that of primitive organisms.

Indeed they were strongly reminiscent of primitive amoeboid organisms seen through a microscope.

Could the moon be home to primitive organisms that emerged during its warmer period?

Nothing but specialized forms of these same one-celled primitive organisms!

More organized than Protozoa, but still very primitive multicellular organisms.

That's what I like about primitive organisms: no wasting time with social niceties.

This is an amazingly sophisticated behavior by a primitive organism with no sense of gravity.